Pioneer TX-90
¥ 49,800 (around 1969)
Commentary
AM/FM stereo tuner announced as a high-end model of the UA series.
FET is used for the FM front-end, and it is composed of two high frequency amplification stages.
For IF amplification, four ICs and a crystal filter with sharp characteristics are used to improve the selectivity and limiter effect in this amplification stage.
It is equipped with a variable muting circuit that can be set to the muting level suitable for strong electric field region and weak electric field region respectively, and it is compatible with the strength of the input.
Both AM and FM are equipped with independent output level control, and the level difference can be adjusted.
It is equipped with a noise filter effective for FM stereo.
The center indication type tuning meter and the signal strength meter work simultaneously at the time of FM.
In addition, the dial indicator is of the light quantity increasing type.
Model Rating
Type | AM/FM stereo tuner |
FM tuner circuit system | High-frequency amplification using FET 2-stage front end IF section using IC and crystal filter FM antenna input 300 Ω balanced type |
Receiving band | FM : 76 MHz to 90 MHz AM : 535 kHz to 1,605 kHz |
Sensitivity (IHF) | FM : 1.7 μ V AM : 10 μ V |
Capture ratio | 1.5 dB (82 MHz, IHF) |
Image ratio | FM : 95 dB (82 MHz, IHF) |
Effective selectivity | 65dB |
Signal-to-noise ratio | 70dB(IHF) 60 dB (30% modulation) |
Distortion factor | 0.3% (400 Hz, 100% modulation) |
Output voltage | 1 V each (400 Hz, 300% modulation, controllable) |
Accessory circuit | FM muting circuit MPX Noise Filter Automatic switching between FM mono and stereo AM ferrite bar antenna Signal strength meter (FM) Center Indicating Type Tuning Meter (AM/FM) FM stereo indicator lamp Dial pointer (light volume increasing dial indicator) FM-AFC Tape Rec connector AC Outlet (1 Linked) |
Power supply voltage | 100 VAC, 50Hz/60Hz |
Power consumption | 12W, 14 va |
External dimensions | Width 405x Height 140x Depth 356 mm |
Weight | 7.8kg |